Electronic toothbrush



FIG. 1 is a front top perspective view;

FIG. 2 is a front view;

FIG. 3 is a rear view;

FIG. 4 is a left side view;

FIG. 5 is a right side view;

FIG. 6 is a top view; and,

FIG. 7 is a bottom view.

The broken lines shown on the drawings depict portions of the electronic toothbrush that form no part of the claimed design. 

CLAIM The ornamental design for an electronic toothbrush, as shown and described. 